20071062 Ver 1_Staff Comments_20070711

DWQ 07-1062 williams ridge
Subject: DWQ 07-1062 williams ridge
From: Cynthia F Van Der Wiele <[e-mail]>
Date: Wed, 11 Ju12007 17:29:48 -0400
To: Ian McMillan <[e-mail]>
Ian: I have reviewed the plans for Annette.
There are currently two level spreaders provided. Both seem odd. The engineer
notes a 55-foot buffer for zone 1 and 20 feet for zone 2 with thick ground cover
for both. Seems to me that Zone 1 will be transitioning to forested and that the
engineer should do weighted average. Additionally there is insufficient detail
within the construction notes for the sequencing and construction of the level
spreaders.
1. Please provide an overall drainage map depicting all pipes along with
topography.
2. The Neuse buffer appears to be drawn from the centerline of the stream rather
than top of bank.
3. Please explain why you have thick ground cover listed for a 55-foot zone 1
vegetation. This will mature to forested over the long term. Thus a weighted
average of Zone 1 and Zone 2 vegetation types should be used.
4. Please include construction sequencing and installation instructions for the
level spreader in your plans.
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